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A stat professor has observed that for several years about 14% of the students who initially enroll in his introduction to stats course withdraw before the end of the semester. A salesman suggests that he try a statistics software package that gets students more involved with computers, predicting that it will cut the dropout rate. The professor can use the software free of charge for one semester as a part of trail package. Initially, 181 students signed up for the statistics course. They used the software suggested, and only 10 dropped out of the course.
a- What is the value of test statistic?
b- Find the P value?
Workers at a large toxic clean up project are concerned that their white blood cell counts may have been reduced. Let x be a random variable that represents white blood cell count per cubic millimeter of whole blood in a healthy adult.
if data containing two variables x and y with x as the only predictor variable for y were standardized the slope of a
Schadek Silkscreen Printing, Inc. purchases plastic cups on which to print logos for sporting events, proms, birthdays, and other special occasions. What is the estimated proportion defective in the population?
plot the great-circle route from washington d.c. 39 degree n 77 degree w to moscow 56 degree n 38 degree e.a what is
Suppose a research firm conducted a study to determine the average amount of money steady smokers spend on cigarettes during a week.
the 70-year long-term record for weather shows that for new york state the annual precipitation has a mean of 39.84
suppose thw weekly amount spent on repairs at a certain computer is normally distributed with a mean of 300 and a
q1. consider the following stem and leaf plotstemnbspnbspnbspnbspnbspnbsp leaf1 nbsp nbsp nbsp nbsp 0 2 5 72 nbsp nbsp
The given level of significance is an alpha of .005. Your MSA is 6,200 and your MSW is 1,000. Will you reject your null hypothesis that all population means are equal or will you not reject?
How do question content and wording, response strategy, and preliminary analysis planning affect question construction? Provide examples of questions that were positively and negatively influenced by these elements.
Suppose the population is normally distributed they make a decision to do a hypothesis test.
What is the required sample size if you need to estimate the number of workers in the United States who are highly satisfied with their job and you want the estimate to be within 2 percentage points of a 96% confidence interval.
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